Antenna



FIG. 1 is a top plan view of an antenna with a base in broken lines.

FIG. 2 is a front elevation view of the antenna of FIG. 1.

FIG. 3 is a bottom plan view of the antenna of FIG. 1.

FIG. 4 is a top perspective view of the antenna of FIG. 1.

FIG. 5 is a top plan view of an antenna; and,

FIG. 6 is a front elevation view of the antenna of FIG. 5.

The broken lines are for environmental purposes only and form no part of he claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 